Integrated domestic airline hub APIs and Payoo/ZaloPay payments. Added Telegram reminders and ZNS notifications.
Stack: Node.js, MySQL, MongoDB, Payoo, ZaloPay · Next.js, Material UI
Backend Engineer · Java / Spring Boot
Building software
people rely on.
Ho Chi Minh City, Vietnam
6+ years building production systems across ERP accounting, airline booking, and payment services.
JavaSpring BootPostgreSQLREST APIsDocker
Open to work
6+ years exp.
Backend systems
// About Me
const profile = { focus: "Reliable Backend Systems" }
I am a backend engineer based in Ho Chi Minh City. Over 6+ years building production systems, I have worked on ERP accounting, airline booking, and payment services.
My work spans REST APIs, Spring Boot microservices, PostgreSQL query tuning, idempotency, testing, and delivery. I also have experience with React and Next.js.
Languages
Java 17, Kotlin, SQL
Backend
Spring Boot, JPA / Hibernate
Database
PostgreSQL, Redis
Delivery
Docker, CI/CD, AWS
// Work Experience
~/experience/genie
$ cat company_info.json
Genie IT Solution · Norway · Fully remote
May 2024 - Oct 2026
Java Backend Engineer
// Responsibilities:
- ▸Owned invoice, expense, and purchase services on a Spring Boot microservices ERP accounting platform
- ▸Built REST APIs with JPA/Hibernate and tuned PostgreSQL indexes and queries
- ▸Used idempotency keys and audit logging on money-moving endpoints
- ▸Tested with JUnit 5 and Mockito and worked with CI/CD
~/experience/cozwork
$ cat company_info.json
Cozwork JSC · Ho Chi Minh City
Mar 2020 - Apr 2024
Fullstack Developer & Team Lead
// Responsibilities:
- ▸Led a team of 2+ developers through code review and releases
- ▸Owned airline booking and payment services, including airline API and payment-gateway integrations
- ▸Built payment and ticket-status reconciliation; used idempotency keys and optimistic locking for peak demand
- ▸Integrated Shopify, Zapier, Klaviyo, and HubSpot through webhooks
- ▸Built backend services for a multi-site healthcare provider; used AWS, Nginx, and CI/CD
Cozwork projects
Worked on visitor-behavior tracking for targeted marketing campaigns as a web developer and team lead.
Stack: Node.js, PostgreSQL, Python, AWS · React, TypeScript
Worked on the frontend for staff dispatch and doctor-managed care plans as a frontend developer and team lead.
Stack: Laravel, MySQL, AWS · Next.js 14, TypeScript, Material UI
Led work on device rental, payments, pickup and return tracking, and availability monitoring.
Stack: PHP Laravel, MySQL, Docker · HTML, CSS, JavaScript
Led mobile app work for NFC business-card sharing with Shopify integration.
Stack: NestJS, AWS, Shopify · React Native, TypeScript
Led work on remote ordering for a drugstore network in Japan.
Stack: MySQL · Angular, Material UI, Scalar
Worked on invoice aggregation, expense management, and financial reporting as a web developer and team lead.
Stack: Java Spring Boot, microservices · Angular, Material UI, Storybook
Built the frontend for a visual project documentation tool.
Stack: PHP Laravel · React, TypeScript, Material UI, JointJS
Worked on device rental, sales, customer support, and inventory management.
Stack: Java Spring Boot, MySQL · HTML, CSS, JavaScript, Bootstrap
Worked on Gmail, Outlook, Google Calendar, and Exchange integrations with centralized payments.
Stack: PHP Laravel, Elasticsearch · React, TypeScript, Material UI
Built the frontend for attendance, performance evaluation, task management, and reporting.
Stack: Java Spring Boot, microservices · Angular, React Native, Material UI
// Skills & Expertise
Languages
<Java 17, Kotlin, SQL/>
Primary languages for backend services and data work.
Backend Development
<Spring Boot, Spring Data JPA / Hibernate, Spring Security/>
REST and OpenAPI services in a microservices architecture.
Data
<PostgreSQL, Redis/>
Schema design, indexing, and query tuning.
Testing & Delivery
<JUnit 5, Mockito, Docker, GitHub Actions, GitLab CI/>
Nginx / Linux and AWS deployment experience.
Messaging
<Kafka, RabbitMQ/>
Conceptual knowledge of both messaging systems.
Also Used
<React / Next.js, TypeScript, Node.js/>
Laravel / PHP and Python experience alongside backend work.
APIs
<REST, OpenAPI/>
API design for accounting, booking, and payment services.
Operations
<AWS EC2, S3, RDS, Nginx / Linux/>
Production delivery and release process.
// Projects & Products
Own product · Early-access MVP
LedgerBase
SEC fundamentals API that ingests EDGAR/XBRL filings and serves normalized financial metrics with lineage to the source filing, accession number, and XBRL concept. Frontend and docs built with AI assistance.
KotlinSpring BootPostgreSQLPython ingestion pipeline
Visit LedgerBase // Education
Bachelor of Technology - BTech
Ton Duc Thang University
Information Technology
2016 - 2022
// Blog
Thoughts, tutorials, and insights about web development
// Get In Touch
Contact Information
dev.tinhnt@gmail.com
Ho Chi Minh City, Vietnam